They think they look sexy...some do ...some don't.
It makes them feel sexy.
They don't want a panty line.
It turns their guys on.
It's comfy for them..I used to wear them until my gyno noticed and said they are not healthy becaue they move feces from (even if you wipe REALLY well) your hole to your vajayjay. That was the thought that stopped me from using them anymore...eeewww.

Side note: I can NOT stand the women/girls that wear them high with low tight pants...ick even on thin women/girls it screams (&*%^( !!!

I hate those things.I personally don't wear them but I know friends that wear them with Jeans because with regular underwear sometimes you can see the underwear lines but a g string solves that problem. Then the rest of the girls think its sexy.They feel worse than a wedgie, just saying....